Echo-Canceller - H3C MSR 20-20 Command Reference Manual

Description
Example

echo-canceller

Syntax
View
Parameter
Table 682 Meaning of the index numbers
Index Meaning
10 The frequency of the first extra
frequency point specified for
detection.
In addition, it must be a frequency
100 Hz greater than or less than the
row and column frequency groups.
11 The frequency of the second extra
frequency point specified for
detection.
In addition, it must be a frequency
100 Hz greater than or less than the
row and column frequency groups.
12 The lower limit of the amplitude of
the input signal. The average
amplitude must be greater than this
threshold for the input signal to be
recognized as a DTMF digit.
Use the
dtmf threshold
detection.
Use the
undo dtmf threshold
The dtmf threshold command issues the thresholds for DTMF dial tone detection
to the underlying layer DSP for the purpose of tuning detection sensitivity and
reliability of the device subtly. Inside the DSP, a set of generic default values have
been configured. They are 1,400, 458, -9, -9, -9, -9, -3, -12, -12, 30, 300, 3,200,
375, with their index being 0 through 12. Professionals can use this command to
adjust the device when DTMF digit detection fails. In normal cases, the defaults
are adopted.
# Set DTMF threshold 9 in voice subscriber line 1/0.
<Sysname> system-view
[Sysname] voice-setup
[Sysname-voice] subscriber-line 1/0
[Sysname-voice-line1/0] dtmf threshold analog 9 40
echo-canceller { enable | tail-length milliseconds }
undo echo-canceller { enable | tail-length }
FXS/FXO/E&M voice subscriber line view
enable: Enables the echo cancellation (EC) function.
Value range
300 to 3,400 Hz,
with a default of
300 Hz.
300 to 3,400 Hz,
with a default of
3,200 Hz.
0 to 700, with a
default of 375.
command to configure the sensitivity of DTMF digit
command to restore the default.
2591
Remarks
-
-
The larger the value is,
the higher the detection
reliability is. However,
the sensitivity drops.